ByteDance
Seedream 4.5
Photorealistic image generation with precise text understanding
imagelive
- Model id
- seedream-4.5
- Typical run
- ~39s
- Inputs
- 8 parameters
- Contract
- async
Call it
bash
curl -X POST https://api.ezflows.io/v1/models/seedream-4.5 \
-H "Authorization: Bearer $EZFLOWS_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt": "a wide shot of a desert at dusk"}'
# { "request_id": "req_8f2a41c9", "poll_url": "…", "status": "queued" }Parameters
| Name | Type | Default | Description |
|---|---|---|---|
| prompt required | string | — | Describe the image. Include subjects like 'serene evening at the beach'. |
| image_input | string[] | — | Input images to guide creation, use 1-3 URLs for reference. |
| size | enum | 2K | Image resolution quality level. '2K' for standard (8-9M pixels), '4K' for high-res (up to 16.7M pixels). When used alone, API optimizes dimensions. When combined with aspect_ratio, dimensions are calculated but may not reach full 4K quality for extreme ratios (e.g., 9:16). Use 'custom' for exact control. |
| aspect_ratio | enum | match_input_image | Image proportions. 'match_input_image' (recommended with image_input) lets API match input aspect ratio and optimize quality. Other ratios (1:1, 16:9, 9:16, etc.) calculate dimensions from size preset. Note: Non-square ratios with 4K may produce lower pixel counts than maximum (e.g., 9:16 gives ~9M pixels vs 16.7M max). Ignored when size is set to custom and both height and width are provided |
| width | integer | 2048 | Custom width in pixels (only when size='custom'). Range: 1024-4096. Total pixels (width × height) must be 3.7M-16.7M. Dimensions rounded to 64-pixel increments. For maximum 4K quality with aspect ratios, calculate dimensions manually. |
| height | integer | 2048 | Custom height in pixels (only when size='custom'). Range: 1024-4096. Total pixels (width × height) must be 3.7M-16.7M. Dimensions rounded to 64-pixel increments. Images below 3.7M pixels will be auto-scaled up. |
| sequential_image_generation | enum | disabled | Choose sequence: 'auto' for batch, 'disabled' for individual images. |
| max_images | integer | 1 | Limit generated images: 1 for single output, 5 for more variety. |
What a run costs
$0.04average · per run
$0.00for a failed run
~39smeasured mean, end to end
How it stacks up
| Model | Price | Unit | Typical run |
|---|---|---|---|
| Seedream 4.5 | avg $0.04 | run | ~39s |
| Nano Banana 2 Lite | from $0.038 | image | ~12s |
| GPT Image 2.5 Flare | avg $0.037 | run | ~17s |
| Seedream 4.0 (4k) | avg $0.035 | run | ~25s |
| Seedream 5.0 Lite: Image-to-Image | avg $0.035 | run | ~47s |